The Core Rulebook is both a campaign setting book describing the Gilded Age-inspired world of the Fairelands and a rulebook that showcases the Illuminated Worlds game engine designed by Stras Acimovic and Layla Adelman. Due out for release next week, Candela Obscura is the first tabletop RPG published by Darrington Press, the game publishing arm of Critical Role. The Candela Obscura Core Rulebook brings a deep and intriguing world and a simple narrative-driven game system to tabletop RPG players.